The Fed has a twin mandate (price stability, maximum employment) and two tools to satisfy it with: rate adjustments and liquidity injection (QE). That's just about it. They aren't allowed or configured to do much of anything else.
If those two tools stop working or produce distorted results, they can't switch tools. They have to keep banging the hammer or choose to do nothing.
What we are seeing here is a failure of Congress and the Presidency, not the Fed. The Fed is doing the only thing it can possibly do in this situation. It has no more tools.